diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index 0dd03f2..e53f16a 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -212,8 +212,8 @@
 acpi_walk_namespace(acpi_object_type type,
 		    acpi_handle start_object,
 		    u32 max_depth,
-		    acpi_walk_callback pre_order_visit,
-		    acpi_walk_callback post_order_visit,
+		    acpi_walk_callback descending_callback,
+		    acpi_walk_callback ascending_callback,
 		    void *context, void **return_value);
 
 acpi_status